package com.example.money.test.RecyclerViewStudy;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

public class DivideItemDecoration extends RecyclerView.ItemDecoration {
    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };
    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider ;
    private int mOrientation ;

    public DivideItemDecoration(Context context,int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        this.mOrientation = orientation;
        a.recycle();
        setOrientation(orientation);

    }

    public void setOrientation(int orientation) {
        if(orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST){
            throw new IllegalArgumentException("invalid orientation");
        }
        this.mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
        if(mOrientation == VERTICAL_LIST){
            drawVertical(c,parent);
        }else{
            drawHorizontal(c,parent);
        }
    }

    public void drawVertical(Canvas c,RecyclerView parent){
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();
        final int chileCount = parent.getChildCount();
        for(int i = 0 ;i< chileCount;i++){
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)
                    child.getLayoutParams();
            final int top = child.getBottom()+params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c,RecyclerView parent){
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int chileCount = parent.getChildCount();
        for(int i = 0 ;i< chileCount;i++){
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)
                    child.getLayoutParams();
            final int left = child.getRight()+params.rightMargin;
            final int right = left + mDivider.getIntrinsicWidth();
            mDivider.setBounds(left,top,right,bottom);
            mDivider.draw(c);
        }
    }
    /*
    设置分割线的padding属性
     */

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if(mOrientation == VERTICAL_LIST){
            outRect.set(0,0,0,mDivider.getIntrinsicHeight());
        }else {
            outRect.set(0,0,mDivider.getIntrinsicWidth(),0);
        }
    }
}
